According to theHindu mythology , when Lord Ram (Lord Vishnu's
avatar) went in search of his wife , Maa Sita (who was kidnapped by
Ravana , the demon) , he met a monkey , named Hanuman , the son of
the ruler of Kishkindha . Hanuman helped Lord Ram in his search and
the fight against Ravana , which led to the release of Maa Sita .
Hanuman was a great devotee of Lord Ram . He was given the boon of
being immortal .
Since he was a monkey , Hindus started worshipping monkeys to
pay their homage to this great deity . This is the reason why
Hindus monkeys are worshipped .